earlman this has been an ongoing problem with the 3.5L and there is a TSB out to reprogram the module. I know that the TSB covers the 2004 model year but I'm not sure about the 2005. I had mine reprogramed in early 2004 and it solved the problem. You may want to check with your dealer.
PS....I'll dig around and see if I can find the TSB for you.
KC

"Even a monkey falls out of a tree once in a while".